diff --git a/src/ci/docker/host-x86_64/dist-powerpc-linux/Dockerfile b/src/ci/docker/host-x86_64/dist-powerpc-linux/Dockerfile
index 7081d9527f060..825392414671d 100644
--- a/src/ci/docker/host-x86_64/dist-powerpc-linux/Dockerfile
+++ b/src/ci/docker/host-x86_64/dist-powerpc-linux/Dockerfile
@@ -26,5 +26,5 @@ ENV \
 
 ENV HOSTS=powerpc-unknown-linux-gnu
 
-ENV RUST_CONFIGURE_ARGS --enable-extended --enable-profiler --disable-docs
-ENV SCRIPT python3 ../x.py dist --host $HOSTS --target $HOSTS
+ENV RUST_CONFIGURE_ARGS="--enable-extended --enable-profiler --disable-docs"
+ENV SCRIPT="python3 ../x.py dist --host $HOSTS --target $HOSTS"
diff --git a/src/ci/docker/host-x86_64/dist-powerpc64-linux-gnu/Dockerfile b/src/ci/docker/host-x86_64/dist-powerpc64-linux-gnu/Dockerfile
index 046406224c347..ad0e210190170 100644
--- a/src/ci/docker/host-x86_64/dist-powerpc64-linux-gnu/Dockerfile
+++ b/src/ci/docker/host-x86_64/dist-powerpc64-linux-gnu/Dockerfile
@@ -26,5 +26,5 @@ ENV \
 
 ENV HOSTS=powerpc64-unknown-linux-gnu
 
-ENV RUST_CONFIGURE_ARGS --enable-extended --enable-profiler --disable-docs
-ENV SCRIPT python3 ../x.py dist --host $HOSTS --target $HOSTS
+ENV RUST_CONFIGURE_ARGS="--enable-extended --enable-profiler --disable-docs"
+ENV SCRIPT="python3 ../x.py dist --host $HOSTS --target $HOSTS"
diff --git a/src/ci/docker/host-x86_64/dist-powerpc64-linux-musl/Dockerfile b/src/ci/docker/host-x86_64/dist-powerpc64-linux-musl/Dockerfile
index 7c8a1e657ac2e..17783b9c73588 100644
--- a/src/ci/docker/host-x86_64/dist-powerpc64-linux-musl/Dockerfile
+++ b/src/ci/docker/host-x86_64/dist-powerpc64-linux-musl/Dockerfile
@@ -27,13 +27,12 @@ ENV \
 
 ENV HOSTS=powerpc64-unknown-linux-musl
 
-ENV RUST_CONFIGURE_ARGS \
-    --enable-extended \
+ENV RUST_CONFIGURE_ARGS="--enable-extended \
     --enable-full-tools \
     --enable-profiler \
     --enable-sanitizers \
     --disable-docs \
     --set target.powerpc64-unknown-linux-musl.crt-static=false \
-    --musl-root-powerpc64=/x-tools/powerpc64-unknown-linux-musl/powerpc64-unknown-linux-musl/sysroot/usr
+    --musl-root-powerpc64=/x-tools/powerpc64-unknown-linux-musl/powerpc64-unknown-linux-musl/sysroot/usr"
 
-ENV SCRIPT python3 ../x.py dist --host $HOSTS --target $HOSTS
+ENV SCRIPT="python3 ../x.py dist --host $HOSTS --target $HOSTS"
diff --git a/src/ci/docker/host-x86_64/dist-powerpc64le-linux-gnu/Dockerfile b/src/ci/docker/host-x86_64/dist-powerpc64le-linux-gnu/Dockerfile
index e3ba51e8ffce0..6a9573cb4231c 100644
--- a/src/ci/docker/host-x86_64/dist-powerpc64le-linux-gnu/Dockerfile
+++ b/src/ci/docker/host-x86_64/dist-powerpc64le-linux-gnu/Dockerfile
@@ -27,11 +27,10 @@ ENV \
 
 ENV HOSTS=powerpc64le-unknown-linux-gnu
 
-ENV RUST_CONFIGURE_ARGS \
-    --enable-extended \
+ENV RUST_CONFIGURE_ARGS="--enable-extended \
     --enable-full-tools \
     --enable-profiler \
     --enable-sanitizers \
-    --disable-docs
+    --disable-docs"
 
-ENV SCRIPT python3 ../x.py dist --host $HOSTS --target $HOSTS
+ENV SCRIPT="python3 ../x.py dist --host $HOSTS --target $HOSTS"
diff --git a/src/ci/docker/host-x86_64/dist-powerpc64le-linux-musl/Dockerfile b/src/ci/docker/host-x86_64/dist-powerpc64le-linux-musl/Dockerfile
index 601c8e905858e..be16966fbe1b4 100644
--- a/src/ci/docker/host-x86_64/dist-powerpc64le-linux-musl/Dockerfile
+++ b/src/ci/docker/host-x86_64/dist-powerpc64le-linux-musl/Dockerfile
@@ -27,13 +27,12 @@ ENV \
 
 ENV HOSTS=powerpc64le-unknown-linux-musl
 
-ENV RUST_CONFIGURE_ARGS \
-    --enable-extended \
+ENV RUST_CONFIGURE_ARGS="--enable-extended \
     --enable-full-tools \
     --enable-profiler \
     --enable-sanitizers \
     --disable-docs \
     --set target.powerpc64le-unknown-linux-musl.crt-static=false \
-    --musl-root-powerpc64le=/x-tools/powerpc64le-unknown-linux-musl/powerpc64le-unknown-linux-musl/sysroot/usr
+    --musl-root-powerpc64le=/x-tools/powerpc64le-unknown-linux-musl/powerpc64le-unknown-linux-musl/sysroot/usr"
 
-ENV SCRIPT python3 ../x.py dist --host $HOSTS --target $HOSTS
+ENV SCRIPT="python3 ../x.py dist --host $HOSTS --target $HOSTS"